Application of enhanced normalized full gradient method to determine the position of potential field anomalies

نویسندگان [English]

A. Yoosefi Tabas1؛ H. Aghajani2

1M.Sc Student, Dept. of Geophysics, Shahrood University of Technology

2Associate Professor, Faculty of Mining, Petroleum and Geophysics Engineering, Shahrood University of Technology

چکیده [English]

Determining the position of potential field anomalies is one of the objectives of data processing, which is done using various methods such as normalized full gradient. The normalized full gradient method used in the interpretation of geophysical data is a semi - quantitative and semi - automatic method, which incorporates Fourier transform for the elimination of the problems associated with the application of the downward continuation filter through an anomalous source. The results will be reliable if the number of harmonics in the Fourier series is used correctly. The enhanced normalized full gradient method analyzes the two curves: the energy ratio curve of the reconstructed anomalies and the depth curve, along with variation in the number of harmonics, and provides a suitable solution for selecting the number of optimal harmonics. This method was applied on synthetic models and satisfactory results were obtained. The enhanced normalized full gradient method has also been used to determine the position of the anomalous body of Jalalabad deposit. The result of this study shows that using the enhanced normalized full gradient method it is possible to determine the number of optimal harmonics and the position of anomalous bodies from potential field anomalies.